CN-116867015-B - Cell switching method and device based on history record

CN116867015BCN 116867015 BCN116867015 BCN 116867015BCN-116867015-B

Abstract

The invention discloses a cell switching method based on a history record, which comprises the following steps. Step S1, the mobile terminal stores source cell information and target cell information of a failed cell switching command corresponding to each time of overtime of a T304 timer, wherein the information is called a first historical record and is stored in the mobile terminal. And step S2, when the mobile terminal subsequently receives the cell switching command, comparing the cell switching command with the first history record, and if the source cell and the target cell of the cell switching command and the source cell and the target cell of the failed cell switching command corresponding to a certain time-out of the T304 timer in the first history record are the same, reducing the timing duration of the T304 timer by the mobile terminal. The invention adjusts the timing time length of the T304 timer based on the history record of the cell switching command which fails, reduces the network breaking time length when the cell switching command fails in the same scene, and improves the user experience.

Inventors

LONG DI
LI WEICHENG
ZHU SHIDIE
XIAO DENGWEI
FENG ZILONG

Assignees

翱捷科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230705

Claims (10)

1. A cell switching method based on history record is characterized by comprising the following steps; step S1, when a mobile terminal receives a cell switching command, a T304 timer is started, if the T304 timer is overtime and a target cell is not accessed yet, the access failure of the target cell is indicated, the mobile terminal stores source cell information and target cell information of the failed cell switching command corresponding to each overtime of the T304 timer, and the information is called a first history record and is stored in the mobile terminal; Step S2, when the mobile terminal subsequently receives the cell switching command, comparing the cell switching command with a first history record, and if the source cell and the target cell of the cell switching command are the same as the source cell and the target cell of the failed cell switching command corresponding to a certain timeout of the T304 timer in the first history record, reducing the timing duration of the T304 timer by the mobile terminal; And step S3, the mobile terminal starts a T304 timer by using the new timing time length to carry out a cell switching process, and if the T304 timer is overtime, the cell switching failure is indicated, and the mobile terminal initiates an RRC connection reestablishment process in a source cell.
2. The method for switching cells based on history record as claimed in claim 1, wherein if the mobile terminal receives the RRC connection reconfiguration message after receiving the same cell switching command of both the source cell and the target cell for a plurality of times, the step S2 is stopped, and the cell switching is still performed by using the timing duration of the T304 timer issued by the network side.
3. The cell handover method according to claim 1, wherein step S1 is changed to step S1a, and step S2 is changed to step S2a; step S1a, when a mobile terminal receives a cell switching command, starting a T304 timer, if the T304 timer is overtime and is not accessed to a target cell, indicating that the target cell is failed to be accessed, storing source cell information, target cell information and current mobile terminal position information of the failed cell switching command corresponding to each overtime of the T304 timer by the mobile terminal, wherein the information is called a second history record and is stored in the mobile terminal; Step S2a, when the mobile terminal subsequently receives the cell switching command, comparing the cell switching command, the current mobile terminal position and the second history record, if the source cell, the target cell and the target cell of the failed cell switching command corresponding to a time-out of the T304 timer in the cell switching command are the same, and the current mobile terminal position is similar to the current mobile terminal position corresponding to the time-out of the T304 timer in the second history record, reducing the timing duration of the T304 timer by the mobile terminal; step S3a, the mobile terminal starts a T304 timer to carry out a cell switching process by using the new timing time length, if the T304 timer is overtime, the failure of the cell switching is indicated, and the mobile terminal initiates an RRC connection reestablishment process in a source cell.
4. A method for switching cells based on history record according to claim 3, wherein if the mobile terminal receives the RRC connection reconfiguration message after receiving the cell switching command of the source cell and the target cell, which are both the same and the mobile terminal is located close, the mobile terminal stops executing step S2a, and still uses the timing duration of the T304 timer issued by the network side to switch cells.
5. A history based cell handover method as claimed in claim 3, wherein said proximity of locations means that the geographical location coordinates are within 50 meters.
6. A method for cell handover based on history according to claim 1 or 3, wherein in step S1 and step S1a, the first history record and the second history record are stored in a baseband database of the mobile terminal.
7. A method for cell handover based on history record according to claim 1 or 3, wherein in step S2 and step S2a, the mobile terminal decreases the timing duration of the T304 timer by 1 level or 2 level from a plurality of fixed values of the timing duration of the T304 timer.
8. A method for cell handover based on history as claimed in claim 1 or 3, wherein in the step S2 and the step S2a, the timing duration of the T304 timer is at least 100ms.
9. The cell switching device based on the history record is characterized by comprising a first recording unit and a first comparison executing unit; The first recording unit is used for storing the source cell information and the target cell information of the failed cell switching command corresponding to each time overtime of the T304 timer in the mobile terminal, wherein the information is called a first history record, and the mobile terminal starts the T304 timer when receiving the cell switching command; The first comparison execution unit is used for comparing the cell switching command with a first history record when the mobile terminal subsequently receives the cell switching command, reducing the timing time length of the T304 timer if the source cell, the target cell and the target cell of the failed cell switching command corresponding to a certain time-out of the T304 timer in the cell switching command are the same, starting the T304 timer by the subsequent mobile terminal by using the new timing time length to carry out a cell switching process, and indicating the cell switching failure if the T304 timer is overtime, and initiating the RRC connection reestablishment process in the source cell by the mobile terminal.
10. The history based cell handover apparatus according to claim 9, wherein the first recording unit is changed to a second recording unit, and the first comparison performing unit is changed to a second comparison performing unit; The second recording unit is used for storing the source cell information, the target cell information and the current mobile terminal position information of the failed cell switching command corresponding to each time of overtime of the T304 timer in the mobile terminal, wherein the information is called a second history record; The second comparing and executing unit is used for comparing the cell switching command, the current mobile terminal position and the second history record when the mobile terminal subsequently receives the cell switching command, reducing the timing duration of the T304 timer if the source cell, the target cell, the current mobile terminal position and the mobile terminal position of the failed cell switching command corresponding to a certain time-out of the T304 timer in the cell switching command are the same, starting the T304 timer by the subsequent mobile terminal by using the new timing duration to perform a cell switching process, and indicating that the cell switching fails if the T304 timer is time-out, and the mobile terminal initiates an RRC connection reestablishing process in the source cell.

Description

Cell switching method and device based on history record Technical Field The invention relates to a method for switching cells of a mobile terminal. Background In cellular mobile communication, a working cell handover of a mobile terminal is allocated by a network side. In an actual network, handover failure is often caused by network planning, site environment, and the like. The general flow of a mobile terminal cell handover failure is described as follows. (1) The mobile terminal works in the source cell A, and the signal intensity measured by the cell B reaches the requirement of a measurement report and is reported to the network. (2) The network issues an RRC connection reconfiguration (RRC Connection Reconfiguration) message including the target cell B configuration and the T304 timer duration. Wherein RRC denotes radio resource control (Radio Resource Control). (3) The mobile terminal attempts random access in cell B according to the network configuration. (4) The mobile terminal cannot be successfully accessed in the cell B due to the field environment, the state of the cell B base station, the excessively high moving speed of the mobile terminal and the like. (5) The mobile terminal continues to attempt access at cell B until the T304 timer expires, initiating an RRC reestablishment procedure (RRC re-establishment procedure) at the source cell a. And when the T304 timer is overtime, the target cell access failure is indicated, the mobile terminal performs corresponding resource rollback and initiates an RRC connection reestablishment process. Throughout the above process, the wireless link of the mobile terminal is always abnormal. If the duration configuration of the T304 timer is too large, the mobile terminal is in an abnormal state for a long time. The mobile terminal belongs to the off-network state in the period of time. Disclosure of Invention The invention aims to solve the technical problem of how to reduce the network breaking time length of the mobile terminal when the cell switching fails. In order to solve the technical problems, the invention provides a cell switching method based on a history record, which comprises the following steps. Step S1, the mobile terminal stores source cell information and target cell information of a failed cell switching command corresponding to each time of overtime of a T304 timer, wherein the information is called a first historical record and is stored in the mobile terminal. And step S2, when the mobile terminal subsequently receives the cell switching command, comparing the cell switching command with the first history record, and if the source cell and the target cell of the cell switching command and the source cell and the target cell of the failed cell switching command corresponding to a certain time-out of the T304 timer in the first history record are the same, reducing the timing duration of the T304 timer by the mobile terminal. Preferably, if the mobile terminal receives the RRC connection reconfiguration message after receiving the cell handover command that both the source cell and the target cell are the same for multiple times, the mobile terminal stops executing step S2, and still uses the timing duration of the T304 timer issued by the network side to perform cell handover. Optionally, the step S1 is changed to step S1a, and the step S2 is changed to step S2a. Step S1a, the mobile terminal stores the source cell information, the target cell information and the current mobile terminal position information of the failed cell switching command corresponding to each time of overtime of the T304 timer, wherein the information is called a second history record and is stored in the mobile terminal. And step S2a, when the mobile terminal subsequently receives the cell switching command, comparing the cell switching command, the current mobile terminal position and the second history record, and if the source cell, the target cell and the target cell of the failed cell switching command corresponding to a time-out of the T304 timer in the cell switching command are the same as the source cell and the target cell of the failed cell switching command corresponding to the time-out of the T304 timer in the second history record, and the current mobile terminal position is similar to the current mobile terminal position corresponding to the time-out of the T304 timer in the second history record, reducing the timing duration of the T304 timer by the mobile terminal. Preferably, if the mobile terminal receives the RRC connection reconfiguration message after receiving the cell handover command that the source cell and the target cell are the same and the mobile terminal is close in location, the mobile terminal stops executing step S2a, and still uses the timing duration of the T304 timer issued by the network side to perform cell handover. Illustratively, the location proximity refers to geographic location coordinates within 50 meters of each ot